I am studying the near blowout instability mechanism in gas turbine combustors where I often come different pressure sensors. Some are dynamic pressure transducers while others are microphones. What type of pressure sensors are suitable to measure pressure fluctuations in gas turbine combustors?
Noorul Huda Greetings, sir. There are several factors that must be considered when determining which instrument should be used in this application. The first is what parameter are you trying to measure? Microphones are generally designed to pick up pressure in the audible sound range from 20 Hz to 20 kHz. This results in a fundamental fastest time response of 0.05 ms. The transient time response is variable but a condenser type microphone will have a faster response. If the parameter you are measuring is the dynamic flow pressure this would be more than adequate.
A high quality dynamic pressure transducer will have a frequency response between 150-1000 kHz. This gives you a fundamental time response of 1 microsecond. This would allow measurement of the pulse type pressure fluctuations due to turbulence. Transient time response is generally not considered in dynamic pressure transducers due to the fast fundamental response.
I hope this helps to answer your question.
Thank You all for your help. It looks like that both microphones and a dynamic pressure transducer will work for me. But my application is combustion that involves temperature, so with temperature in mind, I think I should go for a transducer that can sustain high temperature.
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